Should you pledge or sell your Bitcoin to buy a home?

The ontology — what these things actually are

Most writing on this product starts with the marketing label ("Bitcoin mortgage") and works outward. That is backwards. The label encodes assumptions you should derive, not import. Start from primitives.

What Bitcoin is, structurally

Bitcoin is a digital bearer instrument with five essential properties: scarce (21M cap), bearer (key control = asset control), liquid (24/7 global markets), volatile (50–80% annualized realized vol vs. 12–18% for broad equities), and non-sovereign (no issuer, no central counterparty).

Two of these dominate the mortgage product: bearer makes custody the central design question, and volatile makes the loan structure exotic.

What a mortgage is, structurally

A mortgage is a long-duration secured loan with four essential properties: long-duration (15–30 years), secured by specific collateral, amortizing on a schedule, and recorded with a public lien registry. Its native collateral — real estate — is illiquid, slow-moving, has recorded title, and is use-coupled (the borrower lives in it).

What a Bitcoin-backed mortgage is, derived

Combining the primitives: a Bitcoin-backed mortgage is a long-duration amortizing loan with security interests in two collateral pools with maximally different liquidity and volatility profiles. The lender takes a recorded lien on the property (slow-moving, illiquid) and a security interest in pledged Bitcoin under a custody arrangement (fast-moving, liquid). The borrower retains beneficial ownership of both; the lender's claim is conditional on default events defined in the loan agreement. No traditional secured loan structure pairs collateral with such different time constants. That dual-collateral structure is the thing to understand — everything else is downstream.

The taxonomy

Three products get blurred under the "Bitcoin mortgage" label. They are different from first principles.

Note: the BTC-backed mortgage row collapses three distinct concepts that the deep dive disentangles in the structural-models section below: (1) the percentage of the home's value financed, (2) the ratio of BTC pledged vs. the loan principal, and (3) the per-dollar BTC collateral requirement on a down-payment loan. Different lenders use different combinations of these — always compare specific product disclosures, not just "LTV."

Only the third column — Bitcoin-Backed Mortgage — is the subject of this deep dive. The other two are useful reference points for the trade-offs.

The conventional mortgage path — your reference point

Every BTC-backed mortgage product in the next section is an alternative to a path that already exists: sell some Bitcoin, pay the long-term capital gains tax, use the cash as a normal down payment, and take a standard 30-year conforming mortgage. To evaluate the alternatives honestly, you need to know what the baseline actually costs.

When the conventional baseline beats any BTC-backed alternative

• Low BTC cost basis is close to current price. If the gain you'd realize is small (say, BTC at $100K with $90K basis), the tax cost is small and the deferral benefit of pledging is correspondingly small. Sell and move on.
• Variable income or high cash-flow uncertainty. The conventional mortgage payment is fixed and predictable. Adding BTC-collateral monitoring and potential margin calls compounds risk.
• Limited capacity to manage active positions. If you wouldn't enjoy reading lender disclosures, monitoring custody arrangements, or evaluating refinancing options every few years, the conventional path is dramatically simpler.
• Low BTC conviction. If you don't strongly believe BTC will outperform your mortgage's effective cost of capital, the deferral game isn't worth playing.

When the conventional baseline loses to a BTC-backed alternative

• Large unrealized gain. If selling 1 BTC means realizing $90K of gain at 25% = $22.5K of tax, and the BTC-backed mortgage charges 1.5% APR more than conforming, the tax savings outweigh the rate premium for several years.
• High BTC conviction with stable income. If you expect BTC to compound faster than the mortgage's effective cost of capital and your income can comfortably service the payment regardless of BTC's price, the deferral game is rational.

Other non-BTC reference paths worth knowing

Three additional baselines that may fit specific situations better than either a conventional mortgage or a BTC-backed alternative:

• Cash-out refinance against an existing home. If you already own a home with equity, you can pull cash without touching BTC. Rate is usually conventional + ~50 bps. No BTC custody risk introduced.
• HELOC (home equity line of credit). Variable-rate revolving credit secured by existing home equity. Cheaper than personal credit, more flexible than a refinance. Common alternative for borrowers who own a home outright or with significant equity.
• Securities-backed line of credit (private banks). If you have a significant equities portfolio at a major brokerage (Schwab, Fidelity, Goldman Private Wealth), they will lend against it at rates often 100–200 bps below conforming mortgage rates. Margin call risk applies. This is the "wealthy borrower's" version of a BTC-backed loan and is often cheaper than any of the BTC alternatives — for borrowers who have the qualifying portfolio.

The framework: each BTC-backed mortgage product in the next section needs to be evaluated against this baseline AND the non-BTC alternatives. "Better than nothing" is not the test. "Better than the conventional alternatives I have access to" is the test.

Within BTC-backed mortgages, three structural models

Not every Bitcoin-backed mortgage uses the same risk-transfer mechanism. As of 2026 there are three distinct structural models in market, distinguished by what triggers a liquidation event — price moves, rate adjustments, or only payment delinquency. The choice between them is one of the most important decisions a borrower makes.

Model A — Price-based margin call (Milo)

The mortgage rate is fixed. The lender monitors the BTC collateral's value. If Bitcoin's price drops far enough from origination (Milo's published threshold: a 65% drawdown), the lender issues a margin call. The borrower can add collateral, pay down principal, or accept forced liquidation of pledged BTC.

Milo originated $100M+ on this model. Notable operational detail: Milo has publicly stated it has issued zero margin calls to date, which suggests real-world behavior involves communication and borrower-managed paydowns more than mechanical liquidation at threshold. The structural risk is still real, but the worst case is rarer than the threshold framing alone would suggest.

Model B — Dynamic-rate adjustment (Peoples Reserve)

The mortgage rate is variable, tied to the collateral ratio and Bitcoin's price. If Bitcoin appreciates, the rate falls. If Bitcoin drops, the rate rises — compensating the lender for the added risk. There is no price-triggered margin call. Liquidation occurs only if the borrower defaults on payments.

Peoples Reserve's Bitcoin Powered Mortgage (BPM) is the leading public example. Per company materials and media coverage, rates start around prime + 1 with discounts available for higher collateralization (reportedly reaching low single-digit APRs at substantial over-collateralization); custody uses multisignature wallets with no rehypothecation. Specific rate figures are based on company-quoted terms — verify directly with Peoples Reserve before relying on them.

Peoples Reserve also markets adjacent products (HEBLOC, a Bitcoin-powered Treasury bond) — those are separate structures and out of scope for this deep dive.

Model C — Delinquency-only liquidation (Better + Coinbase, Fannie Mae conforming)

Launched March 2026. The mortgage rate is fixed, the loan is a Fannie Mae-backed conforming mortgage, and — structurally distinct from Models A and B — there are no price-based margin calls and no top-up requirements regardless of how far BTC drops. Per Better's published product description, liquidation risk applies only in the event of a 60-day payment delinquency, the same standard that applies to any conforming mortgage.

Collateralization is set up-front: pledge $2.50 of Bitcoin (or $1.25 of USDC) for every $1 of down payment financed. The crypto sits in Coinbase Prime custody for the life of the down-payment loan. BTC price moves do not affect the borrower's monthly obligation, do not trigger margin calls, and do not put the collateral at price-driven liquidation risk.

Structurally this is the closest product to a traditional conforming mortgage. The crypto serves as up-front collateral for the down-payment loan, not as a continuously monitored LTV variable. If you pay your monthly mortgage on time, the crypto stays where it is, regardless of BTC's price path.

The structural comparison — three models

All three address the same problem (BTC holder wants real estate without selling BTC) but transfer risk through different mechanisms:

Model A's risk lives in the asset (forced sale on price). Model B's risk lives in the cash flow (variable payment). Model C's risk lives in the borrower's payment discipline — structurally the closest thing to a traditional mortgage with extra collateral up front.

None is universally better. A borrower with stable income and a strong view that BTC will compound steadily may prefer Model C — the conforming structure with no active price-monitoring threshold. A borrower with stable income and a willingness to absorb price-path-dependent payment variability may prefer Model B. A borrower with fixed income, lower BTC conviction, and tolerance for the tail-risk of a forced sale event may accept Model A (often at the lowest headline rate).

The remainder of this deep dive — including the formal mechanics in Part III and the interactive calculator in Part V — primarily models Model A, because its price-triggered dynamics produce the cleanest closed-form math and are the most informative for risk-decomposition purposes. Model C borrowers face no price-based liquidation surface, so the LTV-evolution math in Part III does not apply to them in the same way. Model B requires a stochastic interest-rate model dependent on BTC's path and is best evaluated case-by-case with the originating lender.

Mechanics, formalized

The product can be described by a small set of state variables. Stating them formally clarifies what is and is not at risk.

• P(t) — price of Bitcoin at time t (USD per BTC)
• Q — quantity of BTC pledged (fixed at origination)
• L(t) — outstanding loan balance at time t (decreases via amortization)
• LTV(t) = L(t) / (P(t) × Q) — current loan-to-value
• M — the lender's margin-call threshold, expressed as either an LTV ratio or a percentage drop in P(t) from origination

Important caveat about the threshold: The mapping between "BTC price drop from origination" and "LTV ratio at which margin call triggers" depends on the initial collateralization. Milo publishes a 65% price-drop threshold for a product structured with ~1:1 BTC-value to loan-principal at origination, which translates to LTV ≈ 2.86 at trigger. Products structured with different initial collateralization ratios (e.g., Better/Coinbase's 2.5:1 BTC-to-loan ratio for the down-payment loan) map a 65% price drop to a very different effective LTV — and Better/Coinbase doesn't use a price-based trigger at all (Model C above). The threshold logic in this section formalizes Model A (price-based margin call) at the initial-collateralization point Milo uses; it is not a universal rule.

For a borrower in a Model A product: good standing as long as LTV(t) < M. When LTV(t) ≥ M, the lender issues a margin call. The borrower can add to Q, reduce L(t), or do both — or the lender liquidates pledged BTC to restore the LTV.

Three observations from the dynamics:

• Amortization is your friend. Even with flat BTC price, LTV improves every month because L(t) falls. On a 30Y mortgage at 7.5%, L(t) is approximately 86.8% of original principal at year 10, 75.4% at year 15, 58.9% at year 20, and 34.9% at year 25 (standard amortization math).
• Margin-call risk is front-loaded. The first 3–5 years are where LTV is highest and amortization has not built cushion. A drawdown in year 1 is far more dangerous than the same drawdown in year 15.
• Risk falls off a cliff as time passes. By year 10–15, the loan is shrinking and the collateral has had time to compound. Only a near-total wipeout can trigger a margin call from there.

Statistics — Bitcoin's drawdown history

The 65% margin threshold sounds far away. Bitcoin's history says it has happened every cycle.

Note on sources: the peak / trough / drawdown figures below are approximate, rounded from public historical price series (CoinGecko, CoinMarketCap, Coin Metrics). Different sources give slightly different exact peaks and troughs because of exchange-by-exchange variation and timestamp granularity, especially for the 2011 cycle. The pattern — peak-to-trough drawdowns consistently exceeding 75% on a multi-month basis — is robust across sources; the specific decimal place is not. Verify before quoting any specific number.

Drawdowns vs. the 65% margin threshold

Every major cycle has produced a drawdown larger than the 65% threshold. The orange line shows where Milo's margin call would trigger.

Past recovery windows have spanned 22–36 months. The structural lesson: historically, major BTC drawdowns have often reversed over multi-year periods, which means an early forced liquidation can convert a temporary impairment into a permanent loss. Whether any specific borrower experiences a margin event depends on entry timing, initial collateralization, principal amortization, prepayment behavior, and the lender's specific liquidation logic — so "plan around the assumption that one will occur" is one defensible framing, but is not a mechanical rule. A borrower originating mid-cycle with conservative collateralization and steady prepayments faces materially different risk than one originating at peak with maximum leverage.

The strongest defense is mechanical: front-loaded principal paydown. Extra payments in years 1–5 are functionally identical to buying margin-call insurance.

The risk surface, decomposed

Risk on this product is not one-dimensional. Decomposing it makes the evaluation tractable.

The risks are correlated. A BTC drawdown that triggers a margin call typically arrives in the same macro environment as job-loss risk and lender-stress risk. Diversifying across them is harder than it sounds.

Counterparty risk is the deepest cut

Market risk is publicly observable. You can model it, hedge it, watch it. Counterparty risk hides until it ruptures, and then ruptures fully. The 2022 cohort failures (Celsius, Voyager, BlockFi, Genesis) shared a common pattern across multiple distinct precipitating events: maturity mismatch, rehypothecation, counterparty concentration, and pooled non-segregated custody. Each failure also had its own specific triggers — 3AC exposure, FTX/Alameda contagion, run dynamics on yield deposits, regulatory pressure — so reducing 2022 to a single tidy diagnosis would overstate the analysis. The structural pattern across them is more usefully read as a recurring set of vulnerabilities than as a single cause. Ledn and Milo, by contrast, ran with term-matched books, no or limited rehypothecation, counterparty diversification, and bankruptcy-remote custody — and survived the same macro environment.

The lesson for lender evaluation today: structural questions, not promotional claims. Marketing about "safety" is noise. What matters is the legal structure of custody, the disclosure of rehypothecation, and the published bankruptcy-remoteness arrangements.

The strongest cases against

This deep dive is structurally optimistic about Bitcoin-backed mortgages — meaning, it presents them as a real product class with internal logic worth understanding. That framing isn't neutral. Three serious objections deserve direct engagement before you make any decision.

Objection 1 — "Just sell the BTC. You'll be calmer, and the tax cost is the price of peace."

The strongest case for selling outright rather than pledging: every pledge structure introduces a new risk surface (margin call, custody, rehypothecation, lender insolvency, regulatory shift) on top of the BTC volatility risk the borrower already accepts by holding. The borrower also takes on a new psychological burden — monitoring positions, managing cure windows, evaluating lender disclosures. The LTCG tax bill is a one-time, certain cost. The pledge structure is a multi-decade stream of uncertain costs. A holder who would lose sleep watching BTC oscillate around their margin threshold may experience a far lower total cost of ownership simply by selling, paying the tax, and moving on.

This objection lands hardest for borrowers with: (a) low BTC conviction relative to the mortgage horizon, (b) low cost basis equivalents (LTCG tax is small in dollar terms), (c) limited capacity to manage active financial positions, or (d) variable income that compounds margin-call risk with job-loss risk.

Objection 2 — "Rent and stack. Buying a home now is the wrong move, BTC or no BTC."

The strongest case against buying at all in the current environment: residential real estate is illiquid, geographically immobile, and tied to local labor markets and property tax regimes. For a BTC holder whose conviction is global and long-term, locking ~30 years of cash flow into a specific physical location may be a worse trade than continuing to rent and deploying that capital into BTC accumulation. The pledge-vs-sell framing assumes the borrower has already decided to buy. That assumption is the bigger decision.

This objection lands hardest for borrowers who: (a) value geographic optionality, (b) have stable rental options at significantly below buy-equivalent cost in their market, (c) face significant local property tax exposure, or (d) work in industries where remote/global mobility is a real career asset.

Objection 3 — "BTC-backed mortgages are a bull-market product class. The next bear cycle reveals them as a structure that doesn't survive a real recession."

The strongest case that the product class is transient: the 2022 cohort failures eliminated the worst operators, but the survivors (Milo, Better+Coinbase, Peoples Reserve) haven't been tested in a deep multi-year recession that combines a BTC drawdown, a real estate price correction, AND systemic credit stress at the borrower's employer. A 30-year mortgage borrower originating in 2026 is implicitly betting that at least one of the three Tier 1 lenders survives in a recognizable form through the 2030s and 2040s. That is a long bet on a young product class.

This objection lands hardest for borrowers who: (a) lived through 2008's mortgage cascade and remember how quickly novel structures unwound, (b) work in industries that historically experience deep cyclical layoffs (tech, finance, real estate), or (c) cannot easily refinance into a conventional mortgage if their BTC-backed structure collapses mid-term.

What survives the objections

A reader who accepts all three objections may still rationally choose a BTC-backed mortgage if: high BTC conviction, low LTCG cost basis advantage, stable non-BTC-correlated income, willingness to actively manage the position, AND a backup plan for refinancing into a conventional product if the lender's structure deteriorates. Without those conditions, the strongest version of the case against may be the right answer.

Decision framework

The product fits a specific borrower profile cleanly. Outside that profile it ranges from suboptimal to catastrophic.

The product is a good fit when

• Unrealized gain on the BTC is large enough that the tax cost of selling exceeds 2+ years of mortgage interest.
• The pledged BTC is a minority of your total BTC stack, so a forced liquidation is not catastrophic.
• You have stable, predictable income to service the monthly payment regardless of BTC price.
• The lender offers self-custody multisig or bankruptcy-remote qualified custody with no rehypothecation.
• You can make principal prepayments in years 1–5 to compress the LTV before the first cycle drawdown.

The product is a bad fit when

• You would be pledging most or all of your stack.
• Your income is variable or BTC-correlated (working in the industry, BTC-denominated revenue).
• The lender's custody arrangement is opaque or pooled.
• You would be financially fragile if forced to liquidate at the bottom of a cycle.
• Your cost basis is close to current price — small unrealized gain, small tax-deferral benefit, same downside.

The strongest version of the trade is for a holder who is already past the wealth-building phase with respect to Bitcoin, has multiple stacks across different storage arrangements, has stable income from non-Bitcoin sources, and is using the mortgage to deploy a small slice of their stack into housing without disturbing the rest.

Questions to sit with before you sign

The framework, calculator, and decision tree above can take you to the edge of a decision. They cannot make it for you. These prompts are the kind of questions you should be able to answer in your own words — not in vocabulary borrowed from this deep dive — before you sign anything. If a question is uncomfortable, that is information.

1. If Bitcoin dropped 65% next month, what would I actually do? Not what I'd say. What would I do — the specific phone calls, the specific account transfers, the specific source of additional capital. If the honest answer is "I'd panic and sell at the bottom," then Model A is the wrong model for me regardless of its math.
2. In a year where Bitcoin is down 60% and my industry is laying off 20%, what does my monthly cash flow look like? Mortgage payments are due whether or not BTC is in a drawdown. If my income is correlated with BTC's price (working in crypto, tech, or any cyclical industry that historically tracks risk-asset cycles), a BTC-backed mortgage compounds two correlated risks. Is that compounding compatible with how I sleep at night?
3. If my chosen lender — Milo, Better+Coinbase, or Peoples Reserve — disappeared tomorrow, can I refinance into a conventional mortgage at my current income and credit profile? If yes, I have a real backup plan. If no, I am implicitly betting that my chosen lender exists for the full mortgage term, which is a 30-year bet on a young product class.
4. What is the dollar value of the tax I would actually save by pledging instead of selling — and is that bigger than two to three years of mortgage interest? If my BTC cost basis is close to current price, the tax-deferral benefit is small. If my income tax bracket is low, the rate is low. Run the actual numbers. The pledge-vs-sell decision shrinks fast for borrowers without a meaningful LTCG advantage.
5. Of my total net worth, how much would be impaired if Bitcoin AND real estate both dropped 40% in the same year? 2022 and 2008 both had concentrated price events. The pledge structure ties two large positions to overlapping macro risk. If the answer is "most of it," that is a concentration story, not a financial product story — and no choice of mortgage product addresses it.
6. Am I making this decision because the math works, or because I want to own a specific home and the math is the rationalization? Both can be true. Honest acknowledgment of which is upstream of which makes the rest of the analysis cleaner.
7. What is the smallest version of this trade I could do? Could I take a smaller mortgage, pledge less BTC, choose a less-aggressive LTV? The deep dive's calculator runs scenarios at the maximum end of every input. Real decisions get made at the conservative end.

If you can answer these in concrete terms — not abstractions — you are ready to talk to a lender. If you cannot, this deep dive has done its work as background reading, but the decision is not yet ripe.